Update Dangerfile

Dangerfile

@@ -1,8 +1,8 @@
-## Let's check if there are any changes in the project folder
-has_app_changes = !git.modified_files.grep(/SwiftyStoreKit/).empty?
+# Ensure there is a summary for a pull request
+fail 'Please provide a summary in the Pull Request description' if github.pr_body.length < 5
 
-## Then, we should check if tests are updated
-has_test_changes = !git.modified_files.grep(/SwiftyStoreKitTests/).empty?
+# Warn about develop branch
+warn("Please target PRs to `develop` branch") if github.branch_for_base != "develop"
 
 # Make it more obvious that a PR is a work in progress and shouldn't be merged yet
 warn("PR is classed as Work in Progress") if github.pr_title.include? "[WIP]"
@@ -10,6 +10,12 @@ warn("PR is classed as Work in Progress") if github.pr_title.include? "[WIP]"
 # Warn when there is a big PR
 warn("Big PR") if git.lines_of_code > 500
 
+## Let's check if there are any changes in the project folder
+has_app_changes = !git.modified_files.grep(/SwiftyStoreKit/).empty?
+
+## Then, we should check if tests are updated
+has_test_changes = !git.modified_files.grep(/SwiftyStoreKitTests/).empty?
+
 ## Finally, let's combine them and put extra condition
 ## for changed number of lines of code
 if has_app_changes && !has_test_changes && git.lines_of_code > 20